Observation of Electron-Antineutrino Disappearance at Daya Bay

An, F.; Bai, J. Z.; Balantekin, A. B.; Band, H. R.; Beavis, D.; Beriguete, W.; Bishai, M.; Blyth, S.; Boddy, Kimberly K.; Brown, Richard; Cai, B.; Cao, G. F.; Cao, Jun; Carr, R.; Chan, W. T.; Chang, J. F.; Chang, Yun Hsuan; Chasman, C.; Chen, H. S.; Chen, H. Y.; Chen, S. J.; Chen, S. M.; Chen, X. C.; Chen, X. H.; Chen, X. S.; Chen, Y.; Chen, Y. X.; Cherwinka, J. J.; Chu, M. C.; Cummings, J. P.; Deng, Zhi; Ding, Yayun; Diwan, M. V.; Liu, Dong; Draeger, E.; Du, X. F.; Dwyer, D. A.; Edwards, W. R.; Ely, S.; Fang, S. D.; Fu, J.; Fu, Z.; Ge, Liangquan; Ghazikhanian, V.; Gill, R. L.; Goett, J.; Gonchar, M.; Gong, Guanghua; Gong, H.; Gornushkin, Y.; Greenler, L.; Gu, W.; Guan, Mengyun; Guo, X. H.; Hackenburg, R.; Hahn, R. L.; Hans, S.; He, M.; He, Q.; He, Wei; Heeger, K. M.; Heng, Y. K.; Hinrichs, P.; Ho, T. H.; Hor, Y. K.; Hsiung, Y.; Hu, Bei-Zhen; Hu, T.; Huang, Hanxiong; Huang, H. Z.; Huang, Pin‐Wen; Huang, X. T.; Huber, Patrick; Isvan, Z.; Jaffe, D. E.; Jetter, S.; Ji, X. L.; Ji, Xingzhao; Jiang, Hao; Jiang, W.; Jiao, J. B.; Johnson, R. A.; Li, Kang; Kettell, S. H.; Krämer, M.; Kwan, K. K.; Kwok, M. W.; Kwok, T.; Lai, C. Y.; Lai, Wanchang; Lai, W.; Lau, K.; Lebanowski, L.; Lee, J.; Lee, M. K.P.; Leitner, R.; Leung, J. K. C.; Leung, Kwong-Sak; Lewis, C. A.; Li, B.; Li, F.; Li, G. S.; Li, J.; Li, Q. J.; Li, S. F.; Li, W. D.; Li, X. B.; Li, X. N.; Li, X. Q.; Li, Y.; Li, Z. B.; Liang, H.; Liang, Jingjing; Lin, C. J.; Lin, Guey-Lin; Lin, S.; Lin, Shengxin; Lin, Y. C.; Ling, Jiajie; Link, J. M.; Littenberg, L.; Littlejohn, B. R.; Liu, B. J.; Liu, C.; Liu, D. W.; Liu, H.; Liu, J. C.; Liu, J. L.; Liu, S.; Liu, X.; Liu, Y. B.; Lu, C.; Lu, Haoqi; Luk, A.; Luk, K. B.; Luo, T.; Luo, X.; H., L.; M., Q.; B., X.; Y., X.; Q., Y.; Mayes, B.; McDonald, Kirk T.; McFarlane, M. C.; McKeown, R. D.; Meng, Y.; Mohapatra, D.; Morgan, Jerry; Nakajima, Yasuhiro; Napolitano, J.; Naumov, D.; Nemchenok, I.; Newsom, C. R.; Ngai, H. Y.; Ngai, W. K.; Nie, Yao; Ning, Z.; Ochoa-Ricoux, J. P.; Oh, Dong Yoon; Olshevski, A. G.; Pagac, A.; Patton, S.; Pearson, C.; Pec, V.; Peng, J. C.; Piilonen, L. E.; Pinsky, L.; Pun, C. S. J.; Qi, F. Z.; Qi, M.; Qian, X.; Raper, N.; Rosero, R.; Roskovec, B.; Ruan, X. C.; Seilhan, B.; Shao, B.; Shih, Kendrick Co; Steiner, H.; Stoler, P.; Sun, G. X.; Sun, Jian; Tam, Y. H.; Tanaka, H.; Tang, X.; Themann, H.; Torun, Y.; Trentalange, S.; Tsai, O. D.; Tsang, K. V.; Tsang, R.; Tull, C. E.; Viren, B.; Virostek, Steve; Vorobel, V.; Wang, C. H.; Wang, L. S.; Wang, L. Y.; Wang, L. Z.; Wang, M.; Wang, N. Y.; Wang, R. G.; Wang, T.; Wang, W.; Wang, X.; Wang, Y. F.; Wang, Z.; Wang, Z. M.; Webber, D.M.; Wei, Yadong; Wen, L.; Wenman, D.; Whisnant, K.; White, C.; Whitehead, L.; Whitten, C. A.; Wilhelmi, J.; Wise, T.; Wong, Heidy; Wong, H. L. H.; Wong, J.; Worcester, E.; Wu, Fenfang; Wu, Qun; Xia, Dongmei; Xiang, Shitao; Xiao, Qiang; Xing, Zhi-zhong; Xu, G.; Xu, Jilei; Jinsong, Xu; Xu, Wencan; Xu, Y.; Xue, T.; Yang, Chaowen; Yang, Lei; Ye, M.; Yeh, M.; Yeh, Y. S.; Yip, K.; Young, Ben; Yu, Z. Y.; Zhan, Liang; Zhang, C.; Zhang, F. H.; Zhang, J. W.; Zhang, Q. M.; Zhang, K.; Zhang, Q. X.; Zhang, S. H.; Zhang, Y. C.; Zhang, Y. H.; Zhang, Y. X.; Zhang, Z. J.; Zhang, Z. P.; Zhang, Z. Y.; Zhao, J.; Zhao, Q.; Zhao, Yue; Zheng, Lei; Zhong, Weili; Li, Zhou; Zhou, Z. Y.; Zhuang, H. L.; Zou, J. H.

doi:10.1103/physrevlett.108.171803

Cited by 1,955 publications

(1,724 citation statements)

References 24 publications

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“…In this work we illustrate our points, without any loss of generality, by resorting to normal hierarchy of the neutrino mass spectrum and setting the lowest neutrino mass eigenvalue to zero. Furthermore, using the observed central values of the various lepton mixing angles, the elements of the neutrino mass matrix M ν can be found by using the equation [47,48], the left-hand side of equation (3.16) is completely known, at least in orders of magnitude. The actual mass matrix thus constructed has some elements at least one order of magnitude smaller than the others, thus suggesting texture zeros.…”

Section: Jhep02(2014)060mentioning

confidence: 99%

Doubly charged scalar decays in a type II seesaw scenario with two Higgs triplets

Chaudhuri

Grimus

Mukhopadhyaya

2014

J. High Energ. Phys.

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The type II seesaw mechanism for neutrino mass generation usually makes use of one complex scalar triplet. The collider signature of the doubly-charged scalar, the most striking feature of this scenario, consists mostly in decays into same-sign dileptons or same-sign W boson pairs. However, certain scenarios of neutrino mass generation, such as those imposing texture zeros by a symmetry mechanism, require at least two triplets in order to be consistent with the type II seesaw mechanism. We develop a model with two such complex triplets and show that, in such a case, mixing between the triplets can cause the heavier doubly-charged scalar mass eigenstate to decay into a singly-charged scalar and a W boson of the same sign. Considering a large number of benchmark points with different orders of magnitude of the ∆L = 2 Yukawa couplings, chosen in agreement with the observed neutrino mass and mixing pattern, we demonstrate that H ++ 1 → H + 2 W + can have more than 99% branching fraction in the cases where the vacuum expectation values of the triplets are small. It is also shown that the above decay allows one to differentiate a two-triplet case at the LHC, through the ratios of events in various multi-lepton channels.

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Section: Jhep02(2014)060mentioning

confidence: 99%

Doubly charged scalar decays in a type II seesaw scenario with two Higgs triplets

Chaudhuri

Grimus

Mukhopadhyaya

2014

J. High Energ. Phys.

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show abstract

“…Measurements from the Sudbury Neutrino Observatory a few years later, in combination with SK data, revealed that neutrino oscillation was responsible for the apparent deficit of electron neutrinos produced in the Sun [2]. In the most recent major advance, the T2K experiment [3,4] and reactor experiments [5][6][7][8] have established that all three neutrino mass states are mixtures of all three-flavor states, which allows the possibility of CP violation in neutrino oscillation. This paper describes our most recent measurements of neutrino oscillation including our first results from analyses that combine measurements of muon neutrino disappearance and electron neutrino appearance.…”

Section: Introductionmentioning

confidence: 99%

Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with6.6×1020protons on target

Abe¹,

Adam²,

Aihara³

et al. 2015

Phys. Rev. D

279

376

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We report on measurements of neutrino oscillation using data from the T2K long-baseline neutrino experiment collected between 2010 and 2013. In an analysis of muon neutrino disappearance alone, we find the following estimates and 68% confidence intervals for the two possible mass hierarchies: normal hierarchy∶ sin 2 θ 23 ¼ 0.514 þ0.055 −0.056 and Δm 2 32 ¼ ð2.51 AE 0.10Þ × 10 −3 eV 2 =c 4 and inverted hierarchy∶ sin 2 θ 23 ¼ 0.511 AE 0.055 and Δm 2 13 ¼ ð2.48 AE 0.10Þ × 10 −3 eV 2 =c 4 . The analysis accounts for multinucleon mechanisms in neutrino interactions which were found to introduce negligible bias. We describe our first analyses that combine measurements of muon neutrino disappearance and electron neutrino appearance to estimate four oscillation parameters, jΔm 2 j, sin 2 θ 23 , sin 2 θ 13 , δ CP , and the mass hierarchy. Frequentist and Bayesian intervals are presented for combinations of these parameters, with and without including recent reactor measurements. At 90% confidence level and including reactor measurements, we exclude the region δ CP ¼ ½0.15; 0.83 π for normal hierarchy and δ CP ¼ ½−0.08; 1.09 π for inverted hierarchy. The T2K and reactor data weakly favor the normal hierarchy with a Bayes factor of 2.2. The most probable values and 68% one-dimensional credible intervals for the other oscillation parameters, when reactor data are included, are sin 2 θ 23 ¼ 0.528 þ0.055 −0.038 and jΔm 2 32 j ¼ ð2.51 AE 0.11Þ × 10 −3 eV 2 =c 4 .

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“…Actually, the neutrino oscillation experiments provide us that there are two neutrino mass squared differences and two large mixing angles. The reactor neutrino experiments also observed non-zero θ 13 , which is the last mixing angle of the lepton sector [1,2,4]. The T2K experiment reported the first stage of the CP violating Dirac phase δ CP through the electron neutrino appearance in a muon neutrino beam [5].…”

Section: Introductionmentioning

confidence: 99%

“…The neutrino experiments [1]- [5] are one of the most attractive experiments for the evidence of the beyond the standard model (SM). Actually, the neutrino oscillation experiments provide us that there are two neutrino mass squared differences and two large mixing angles.…”

Section: Introductionmentioning

confidence: 99%

Mass limit for light flavon with residual Z3 symmetry

Muramatsu

Nomura

Shimizu

2016

J. High Energ. Phys.

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We present a modified Altarelli and Feruglio A 4 model where an additional A 4 singlet-prime flavon is introduced. In this model, non-zero θ 13 is given by this additional A 4 singlet-prime flavon which breaks tri-bimaximal mixing. In the framework of the supersymmetry with U(1) R symmetry, we obtain vacuum expectation values (VEVs) and VEV alignments of flavons through driving fields. It is considered that flavon induces distinctive flavor violating process if flavon mass is light. Assuming mass of SUSY particles are sufficiently heavy so that the SUSY contributions can be negligible, we discuss the flavor violating Yukawa interaction through flavon exchange in the charged lepton sector. According to the potential analysis, the VEV of flavon breaks A 4 down to Z 3 in the charged lepton sector and relation among flavon masses is determined. Thanks for the residual Z 3 symmetry, many lepton flavor violating decay modes are forbidden except for τ → µµē and τ → eeμ. A mass limit of the flavon from these three-body decay modes is 60 GeV taking into account the current experimental lower bounds at the Belle experiment. In our model, we predict a ratio of the branching ratios τ → µµē and τ → eeμ by using known charged lepton masses. We also find that the production cross section for the flavon can be O(1) fb. Thus the flavon would be found at the LHC run 2 by searching for 4-tau lepton signal.

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Observation of Electron-Antineutrino Disappearance at Daya Bay

Cited by 1,955 publications

References 24 publications

Doubly charged scalar decays in a type II seesaw scenario with two Higgs triplets

Doubly charged scalar decays in a type II seesaw scenario with two Higgs triplets

Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with6.6×1020protons on target

Mass limit for light flavon with residual Z3 symmetry

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